What version of SketchUp are you really using? Your forum profile makes no sense. There is no Free (web) version 2018. The free web version does not have any facility to import .dwg files. The answer to your question depends on the version you are using.
And in answer to your question, set up a scene with the camera set to Parallel Projection and the appropriate standard view. Then either export the .dwg from SketchUp or send it to LayOut and set up there. Then export the 2D .dwg.